diff options
Diffstat (limited to 'drivers/s390/char/tape_char.c')
| -rw-r--r-- | drivers/s390/char/tape_char.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/s390/char/tape_char.c b/drivers/s390/char/tape_char.c index 2125ec7d95f..539045acaad 100644 --- a/drivers/s390/char/tape_char.c +++ b/drivers/s390/char/tape_char.c @@ -18,6 +18,7 @@ #include <linux/proc_fs.h> #include <linux/mtio.h> #include <linux/smp_lock.h> +#include <linux/compat.h> #include <asm/uaccess.h> @@ -37,8 +38,9 @@ static ssize_t tapechar_write(struct file *, const char __user *, size_t, loff_t static int tapechar_open(struct inode *,struct file *); static int tapechar_release(struct inode *,struct file *); static long tapechar_ioctl(struct file *, unsigned int, unsigned long); -static long tapechar_compat_ioctl(struct file *, unsigned int, - unsigned long); +#ifdef CONFIG_COMPAT +static long tapechar_compat_ioctl(struct file *, unsigned int, unsigned long); +#endif static const struct file_operations tape_fops = { @@ -46,7 +48,9 @@ static const struct file_operations tape_fops = .read = tapechar_read, .write = tapechar_write, .unlocked_ioctl = tapechar_ioctl, +#ifdef CONFIG_COMPAT .compat_ioctl = tapechar_compat_ioctl, +#endif .open = tapechar_open, .release = tapechar_release, }; @@ -457,15 +461,22 @@ tapechar_ioctl(struct file *filp, unsigned int no, unsigned long data) return rc; } +#ifdef CONFIG_COMPAT static long tapechar_compat_ioctl(struct file *filp, unsigned int no, unsigned long data) { struct tape_device *device = filp->private_data; int rval = -ENOIOCTLCMD; + unsigned long argp; + /* The 'arg' argument of any ioctl function may only be used for + * pointers because of the compat pointer conversion. + * Consider this when adding new ioctls. + */ + argp = (unsigned long) compat_ptr(data); if (device->discipline->ioctl_fn) { mutex_lock(&device->mutex); - rval = device->discipline->ioctl_fn(device, no, data); + rval = device->discipline->ioctl_fn(device, no, argp); mutex_unlock(&device->mutex); if (rval == -EINVAL) rval = -ENOIOCTLCMD; @@ -473,6 +484,7 @@ tapechar_compat_ioctl(struct file *filp, unsigned int no, unsigned long data) return rval; } +#endif /* CONFIG_COMPAT */ /* * Initialize character device frontend. |